[Octave-bug-tracker] [bug #44201] "whos" and gui display non-integer sizes inf/nan poorly

[Colin Macdonald]

URL:
  <http://savannah.gnu.org/bugs/?44201>

                 Summary: "whos" and gui display non-integer sizes inf/nan
poorly
                 Project: GNU Octave
            Submitted by: cbm
            Submitted on: Sat 07 Feb 2015 02:55:23 PM GMT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

I attach a patch.

- - - - - - - - - - - - - - - - - - - - - - - -

"whos" and "gui" blindly convert sizes to int as if all objects would have
integer sizes, how presumptuous ;-)

Seriously, examples where this is done:

1.  Matlab allows at least size to return "inf".  Chebfun (www.chebfun.org)
does this for example.  I would like to get chebfun running on Octave soonish.
 (Their logic is that a function in treated as a length infinity vector).

2.  I'm contemplating returning [nan 3] from size.m for matrices with symbolic
size (e.g., "n x 3") in the "symbolic" pkg.

Both nan and inf sizes seem ok in Octave (no problems noted yet) but "whos"
and the GUI display the sizes wrong:


   Attr Name             Size                     Bytes  Class
   ==== ====             ====                     =====  =====
        a      -2147483648x-2147483648                8  nansz

where "a" is "nan by inf" object.

- - - - - - - - - - - - - - - - - - - - - - - - - - - -

With my patch, I get:


>> a = nansz(42)
class is: nansz
 with data:
 42
>> whos
Variables in the current scope:

   Attr Name        Size                     Bytes  Class
   ==== ====        ====                     =====  =====
        a         nanxinf                        8  nansz

Total is 1 element using 8 bytes


This could be further improved to "NaNxInf" (as Matlab does), and/or perhaps
also by using the unicode for $\times$.

Comments?



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File Attachments:


-------------------------------------------------------
Date: Sat 07 Feb 2015 02:55:23 PM GMT  Name: nansz.m  Size: 79B   By: cbm

<http://savannah.gnu.org/bugs/download.php?file_id=33022>
-------------------------------------------------------
Date: Sat 07 Feb 2015 02:55:23 PM GMT  Name: size.m  Size: 244B   By: cbm

<http://savannah.gnu.org/bugs/download.php?file_id=33023>
-------------------------------------------------------
Date: Sat 07 Feb 2015 02:55:23 PM GMT  Name: infnan_size_whos_gui_output.diff 
Size: 2kB   By: cbm

<http://savannah.gnu.org/bugs/download.php?file_id=33024>

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